Driving arrangements



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DRIVING ARRANGEMENTS Original Filed March 21, 1952 17 Sheets-Sheet 15 IN V EN TOR.

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D R a A n M E E N Df R E O H t T T a A N r Y B //U United States Patent The present application is a continuation application of my copending application Serial No. 277,880, filed March 21, 1952, now abandoned and entitled Driving Arrangement.

The present invention relates to driving arrangements. More specifically the present invention relates to driving arrangements of the unitary type and preferably driving arrangements of the kind normally known in the trade as clutch motors or motors of the clutch-and-brake type.

The invention also relates to driving arrangements of the clutch-and-brake type such as; for instance, used in sewing machines for the clothing industry Without, however, being confined to sewing machines.

In sewing machines for private or private or domestic use the velocity of the machine does not play an important role. In the use of sewing machines for the readymade clothing industry it is necessary, however, to run the machine at a high speed and this high speed must be obtained instantaneously with the start of the machine. Therefore, in such sewing machines the driving spindle runs continuously and a clutch mechanism is used for coupling the sewing mechanism to the continuously rotating driving spindle. Thus, the sewing machine will run at full speed substantially immediately after shifting of the clutch'to the driving position thereof.

In order to stop-the sewing machine as instantaneously as it is started, a clutch is arranged to be shifted to engage a brake member. The machine will, therefore, also stop substantially instantaneously.

The position of the movable parts of a sewing machine of the prior art, however, is usually incidental, i.e., not preselected, when the sewing machine is stopped. This is a disadvantage because in some cases in order to turn the work about the needle the latter must be in the down position thereof, when the machine is stopped, while in other cases the needle must be in the raised position thereof, as, for example, in order to remove the work from the machine.

The usual way of correcting for the Wrong position of the needle when the machine is stopped is to rotate the balance wheel of the machine by hand. Such a manual correction is, however, irrational and time-wasting. It requires the operator to remove one hand from the work. A time analysis will show that the waste of time due to such manual needle adjustment may run up to approximately twenty-five percent or more of the total working time.

It is, therefore, an object of the present invention to provide a driving arrangement of the clutch-and-brake type, which will enable full control with the driven machine, such as a sewing machine, with the further possibility of stopping the latter when the movable parts thereof are in a desired or preselected position.

It is a further object of the present invention to provide a clutch-and-brake driving arrangement which enables a further predetermined movement of the machine which is continued to be driven after having shifted the clutch from engagement with the driving spindle to engagement with the brake member.

It is a further object of the present invention to provide a unitary driving arrangement which can be generally applied to any existing or new machine and which is capable of operating as a high-speed drive means or a low-speed drive means and which is also adapted to stop the driven machine with the movable parts thereof in a desired or preselected position when used as a low-speed drive means.

Another object of the present invention resides in providing a clutch-motor having a brake member which is capable of operating as a combined high-speed and lowspeed drive means for a driven machine.

It is still a further object of the present invention to provide a driving arrangement of the type specified which will enable an automatic stop of the driving arrangement when the movable part of the machine, such as, for instance, the stitch-forming mechanism of a sewing machine, is in at least one predetermined position.

A further object of the present invention is to provide a driving arrangement in which the machine can be stopped with the movable parts in one of a plurality .of predetermined positions which may be preselected in advance by the operator.

The invention further aims to provide simple and reliable arrangements and operating devices to fulfill the purposes specified hereinabove and other purposes which will appear from the following specification.

The term sewing machine, as used in the following specification, is to be interpreted in its broadest sense so as to include not only ordinary sewing machines having a reciprocatory needle, for instance, an upwardly and downwardly moving needle, but any kind of sewing machines designed for special purposes, such as, for example, a padding machine.

In order that the invention may be more clearly understood, some preferred embodiments thereof will now be described with reference to the accompanying drawings in which:

FIGURE 1 is a perspective view of a sewing machine having amotor arrangement according to one embodiment of the invention;

FIGURE 2 is an axial cross-sectional view on enlarged scale through a motor and clutch-and-brake arrangement in accordance with the present invention;

FIGURE 3 is a schematic diagrammatic view showing the motor arrangement in connection with an automatic control in accordance with the present invention for stopping the sewing machine with the needle in a predetermined position;

FIGURE 4 is an enlarged elevational view of a detail of the arrangement shown in FIGURE 3;

FIGURE 5 is a schematic diagrammatic view, similar to that shown in FIGURE 3, of a modified embodiment in accordance with the present invention provided with an automatic control for stopping the sewing machine with its movable parts in two different predetermined positions;

FIGURE 6 is a schematic wiring diagram showing the circuits in still another embodiment of an arrangement in accordance with the present invention in which the auxiliary drive in reversible;

FIGURE 7 is a perspective view of one embodiment of a treadle designed for operating the machine and control arrangement in accordance with the present invention;

FIGURE 8 is a schematic diagrammatic view, similar to that shown in FIGURES 3 and 5, of still another embodiment in accordance with the present invention;

FIGURE 9 is a perspective view of one embodiment of the auxiliary drive having a mechanical transmission in accordance with the present invention;

FIGURE 10 is a schematic diagrammatic View of a modified embodiment of the arrangement shown in FIG- URE 3;

FIGURE 11 is a perspective view of a modified embodiment of the treadle arrangement shown in FIG- URE 7;

FIGURE 12 is a schematic diagrammatic view of still another embodiment of the arrangement Sl'lOlWH in FIG- URE FIGURE 1.3 is a schematic diagrammatic view of still another modified embodiment of the arrangement shown in FIGURE 11;

FIGURE 14 is a perspective view of a modified embodiment of the treadle arrangement shown in FIG- URE 11;

FIGURE 15 is a schematic diagrammatic view of an arrangement similar to that shown in FIGURE 13 provided with a treadle arrangement as shown in FIG- URE 14;

FIGURE 16 is a partial perspective view, with parts thereof broken away, of another embodiment of a switch arrangement including mercury switch tubes;

FIGURE 17 is an axial cross-sectional view of the em bodiment shown in FIGURE 16;

FIGURE 18 is a partial plan view of a switch arrangement including a switch as shown in FIGURE 16;

FIGURE 19 is an end view of the switch arrangement shown in FIGURE 18;

FIGURE 20 is a schematic wiring diagram showing an arrangement including a switch as shown in FIGURE 16;

FIGURE 21 is a schematic wiring diagram of a modification of the arrangement shown in FIGURE 20, in which the machine is able to stop in one or two alternative positions;

FIGURE 22 is a schematic wiring diagram of a further modification of the arrangement shown in FIGURE 21 in which the machine is also adapted to be reversed, and

FIGURE 23 is a perspective view of a further modification of the treadle arrangement shown in FIGURES 7 and 11.

Though in the following description the present invention will be explained specifically with reference to a sewing machine, it will be understood that the invention is not limited hereto. As explained hereinabove, the problem of obtaining an essentially instantaneous starting and stopping of the machine is an important problem in connection with sewing machines for the ready-made clothing industry, but it will be understood that the present invention may be used also in connection with other working machines in which the same problem is present. I

It will further be understood that though the instant invention, in the following description, is explained in connection with sewing machines having a single driving unit, viz a machine having a separate driving motor, this is not essential to the present invention. The coupling arrangement may equal well be used in connection with machines which are driven from a common driving spindle feeding a plurality of machines. The term driving motor or driving means when used in the following description should, therefore, be interpreted in its broadest sense so as to encompass any type of power drive including a rotatable driving spindle or driving element.

Referring now to the drawing, wherein like reference numerals are used throughout the various views to designate like parts, and more particularly to FIGURES 1 and 2, reference numeral It) designates therein a table for a sewing machine 12 having adriving wheel or balance wheel 14. The table 10 is supported by upright frame members or the like 16 and 18 which at their lower ends are connected with one another by means of a cross bar 20. The sewing machine 12 is driven from a motor 26 suspended beneath the table It) in any suitable manner. The driving means includes a driving cord or belt 22 driven from a pulley 6-0 on the motor 26. The coupling between the motor 26 and the pulley 60 is controlled by means of the treadle or pedal 148,

which by means of a pull-rod or the like 146 is connected with a pivotable member 66 by means of which a clutch element 62 (FIGURE 2) is shiftable between two positions of engagement thereof with cooperating parts.

By means of a further treadle or pedal 152, which is connected to by means of a pull-rod or the like with a switch arm 151 (FIGURE 1) extending from the housing 149 of a switch the operator, after having decoupled or disengaged the motor by means of the treadle 148, as will be explained more fully hereinafter, is able to control the further movement of the sewing machine 12 in such a manner that the machine can be stopped with the needle in a wanted preselected or predetermined position.

The motor, which is shown in greater detail in FIG- URE 2, may be of any suitable construction having a stationary part 27 and a rotor 29 (FIGURE 2). The rotor 29 is arranged on a spindle 33 rotatably supported in anti-friction bearings 36 and 37, respectively. The right hand bearing 36 is arranged within an interior partition 35. The left hand bearing 37 is arranged in an end cover plate 33. At the opposite end of the motor another cover plate 34 is arranged within which the clutch mechanism is supported. The right hand end of the driving spindle 38 carries a flywheel 48 having in its surface remote from the left hand cover plate 33 a driving clutch element in the form of an annular groove 42 in which is arranged an annular ring or disk 44 of a suitable frictional material, such as, for example, made of fiber.

The end cover plate 34 is provided with an inwardly extending tubular member 48. The inwardly extending tubular member '48 simultaneously forms a guide or housing for a tubular bushing 50, which accommodates on the inside thereof adjacent the ends the anti-friction bearings 52 and 54 supporting internally thereof a rotatable driven spindle 56.

The cover 34 is recessed at 58 for accommodating a small auxiliary motor 59 (FIGURES 1 and 2). The motor 59 is secured in any convenient manner (not shown) to the main motor in the recess 58.

.The spindle 56 extends outwardly of the right hand end of the bushing 50 and is provided with a pulley 60 mounted on the outwardly projecting spindle extension. The left hand end of the spindle 56 extends into the motor housing and is provided thereat with a driven clutch element 62 in the form of a clutch disc. The right hand end of the bushing 50 is also extended beyond the cover plate 34 and is provided thereat with an arm 64 rigidly secured thereto. This arm 64 may either be an integral part of the pivotal member 66 (FIGURE 1) or, alternatively, the connecting rod between the treadle 148 and the motor 26 may be secured directly to the end of the arm 64.

A helical groove '70 cooperating with the end of a pin 72 is provided in bushing 50. This pin 72 is arranged in a bore 73 in the end cover 34 and is secured in any convenient manner, for instance, by means of a set screw 75 extending into an annular groove '77 provided in the pin 72.

An annular member '76 is rotatably arranged on the external cylindrical surface of the inwardly extending tubular member or housing 48. This annular member 76 is prevented from being axially displaced by abutting at its right hand side against a shoulder 79 of the end cover housing 34 and at its left hand side against a ring 81 received in an annular groove also formed in the end cover housing 34 and retained therein for instance, by resilient action. The annular member 76 is provided with a flange 82 having in its left hand surface an annular groove 86 in which is arranged an annular ring or disc 88 of a suitable friction material, such as, for instance, made, made of fiber. Preferably the friction ring 88 is of the same diameter as the friction ring 4 mounted in the flywheel 49. The clutch disc 62 is provided with complementary annular rib portions 74 and 9%), respectively, for selective engagement with the rings 44 and 88,

respectively. The annular member 76 is further provided at the circumference thereof with a worm gear 92 meshing with a worm 94, the shaft 96 of which (FIG- URES 1 and 27) extends outside the end cover housing 34 and is provided at the outward extension thereof with a pulley 98 (FIGURE 1) which is connected by means of a driving belt 99 With a similar pulley'101 mounted on the spindle of the auxiliary motor 59. It will be understood that instead of arranging the auxiliary motor 59 and the worm 94 on opposite sides of the main driving motor 26, the auxiliary motor 59. may, as an alternative, be placed in direct connection with the worm shaft 96.

The circuit of the auxiliary motor 59 may be selectively closed or opened by means of the switch 149 controlled by the treadle 152 (FIGURE 1).

Operation The operation of the arrangement so far described is as follows:

The main motor formed by electric motor 27 and 29 is maintained in continuous rotation. By operating the treadle 148 the arm 64 is swung or pivoted by means of the pull-rod 146. This in turn will rotate the bushing 50 operatively connected with pull-rod 146 and due to the engagement between the pin 72 and the helical groove 70 in the bushing 50, any rotation of the bushing 50 will be translated thereby into an axial displacement thereof. The spindle 56 will participate in this axial displacement of bushing 50 and the clutch disk 62 will there- 'by be shifted between the two extreme positions corresponding to the two engaged positions thereof. In its left hand position the clutch disc 62 is' in frictional engagement with the friction ring 44 on the flywheel 40,

which thereby couples the driven spindle 58 directly tothe motor spindle 38. The sewing machine will thereby be started instantaneously. In its extreme right hand position, the clutch disc 62 will be in frictional engagement with the ring 88 on the brake member 76. This results in an instantaneous stoppng of the sewing .machine. If the position of the movable parts, primarily the needle of the sewing machine, when stopped instantaneously, is not the wanted position, a correction can be made by means of the auxiliary motor 59. This motor may, as shown in FIGURE 1, be started at will by operating the treadle 152 and thereby operating the switch 149 in the auxiliary circuit. The auxiliary motor 59 when started drives by means of belt 99 the worm shaft 96 which in turn rotates the worm wheel 76 and will thereby rotate, at a relatively slower speed, the clutch disk 62, which is in frictional engagement with the annular friction ring 88 of the flange 82 connected with worm wheel 92. Thus, a relatively slow or slower movement will be imparted to the sewing machine by suitably operating treadles 148 and 152. The speed is so adapted that the operator is able to stop the machine by operating the treadle 152 when the needle is in the wanted position by selectively breaking the circuit of the auxiliary motor 59.

Instead of the above-described method of control for the selective closing and breaking of the circuit of the auxiliary motor59 at the will of the operator, the present invention may be modified to provide an automatic control by means of which the sewing machine may be stopped automatically with the needle in one or more predetermined positions, for instance, in the top position or in the down position thereof.

One embodiment in which the needle is automatically stopped in a predetermined position is shown in FIG- URES 3 and 4. In FIGURE 3, a threephase main motor 26 is shown having feed leads A, B and C. The auxiliary motor 59 may, for instance, in a manner which will be more fully described with reference to FIGURE 6, be inductively supplied from the stator of the main 6 motor 26. It will be understood that by feeding the auxiliary motor 59 inductively from the stator of the main motor 26, it is possible to feed the auxiliary motor 59 with relatively low voltage so as to enable the use of more simple switches in the circuit of the auxiliary motor 59 and to avoid any danger. The supply leads of the auxiliary motor are designated by reference characters a, b and c. The breaking of the supply circuit for the auxiliary motor 59 is effected in two of the phases, viz the leads]; and c by means of switches of which,

in order to simplify the drawing, only one switch 202,.

arranged in the phase lead b, is shown. This switch 202 consists of a fixed contact spring 204 and a movable contact spring 206, the latter being carried by a pivoted arm 208. The contacts are arranged in a housing 210 shown schematically only in which the contact spring 204 is firmly secured, for instance, on a relatively fixed support 205. The arm 208 is pivoted in a bracket 212 in the housing 210. The arm 208 projects through an aperture 214 in the housing and the end 209 of the arm extends in the path for a cam member 216 which may be arranged within the periphery of the flywheel 218 of the sewing machine 12. This cam member 216 will constitute means for selectively operating, for instance, operating the switch within a certain portion of its path, viz in a certain position of the actuating mechanism of the machine.

To prevent the cam member 216 from engaging the end 209 of the arm 208 during each revolution of the flywheel 218, which would give rise to an undesirable noise during the operation of the machine 12, the cam member 216 may, as shown in FIGURE 4, be pivoted on a pin 220 and be influenced by a spring 222, which will resiliently hold the cam member against a stop 224. By including in the cam member a suitable weight it will be possible, by means of centrifugal force, to keep the cam member 216 in the position shown in FIGURE 4 in dotted lines during normal full-speed operation of the sewing machine 12. In this position the cam member 216 will no longer be in the path of the end 209 of the contact arm 208.

Operation The arrangement shown in FIGURE 3' operates in the following manner:

The auxiliary motor 59 Will be running continuously during the operation of the main motor 26, the motor circuit being normally closed through the switch 202. When the main motor 26 is decoupled and the clutch member 62 is brought, by means of the treadle 148, into engagement with the brake disk 76 (FIGURE 2), the sewing machine 12 is driven by means of the auxiliary motor 59 but at a relatively slow speed. At this stage, the spring 222 will press the cam member 216 inwardly into engagement with the stop 224, and in this position the cam member 216 will cooperate with the end 209 of the contact arm 208 and thereby raise this arm to open the switch 202 so as to brake the driving or energizing circuit for the auxiliary motor 59. The position of the cam member 216 in the flywheel 218 is such that the breaking or opening of the auxiliary motor energizing circuit takes place with the needle of the sewing machine 12 in a predetermined position, for example, in the high position.

It will also be possible to arrange the circuit in such a manner that the needle of the sewing machine can be stopped automatically at will either in the high position or in the down position thereof. An arrangement for this purpose is shown in FIGURE 5. In this embodiment a four line double pole switch generally designated by reference character U is inserted in the twoph-ase leads b and c. This switch U may be operated, directly or indirectly as indicated, by the treadle arrangement of the machine or by a manually operated device. At the right hand side of this switch, as viewed in FIG- 

13. A DRIVING ARRANGEMENT FOR A SEWING MACHINE HAVING A MAIN SPINDLE AND INCLUDING A CLUTCH MOTOR HAVING A DRIVING CLUTCH MEMBER, A BRAKING MEMBER, A DRIVEN CLUTCH MEMBER LOCATED BETWEEN SAID DRIVING CLUTCH MEMBER AND SAID BRAKING MEMBER AND AN OUTPUT SPINDLE OPERATIVELY CONNECTED WITH SAID DRIVEN CLUTCH MEMBER, COMPRISING CONTINUOUSLY ROTATING HIGH SPEED DRIVE MEANS OPERATIVELY CONNECTED WITH SAID DRIVING CLUTCH MEMBER, SLOW SPEED DRIVING MEANS SPACED FROM SAID SEPARATE FROM SAID HIGH SPEED DRIVE MEANS AND OPERATIVELY CONNECTED WITH SAID BRAKING MEMBER FOR DRIVING THE LATTER AT RELATIVELY LOWER SPEED, MEANS FOR ALTERNATELY AND SELECTIVELY CONNECTING SAID DRIVEN CLUTCH MEMBER ONLY WITH SAID DRIVING CLUTCH MEMBER OR SAID BRAKING MEMBER TO THE EXCLUSION OF ONE ANOTHER, ELECTRICAL CONTROL MEANS OPERABLE TO SELECT ONE OPERATING CONDITION FOR SAID LOW SPEED DRIVING MEANS TO DRIVE SAID OUTPUT SPINDLE BY WAY OF SAID DRIVEN CLUTCH MEMBER AT LOW SPEED AND ANOTHER OPERATING CONDITION IN WHICH SAID LOW SPEED DRIVING MEANS IS RENDERED INEFFECTIVE TO THEREBY STOP THE DRIVING OF SAID OUTPUT SPINDLE, AND MEANS OPERABLE TO CONTROL THE PRESECTION OF SAID OPERATING CONDITIONS. 